Relieving mechanism for grinding machines



ay 28 1929. J. BAT Em 1,715,0 4

RELIEVING MECHANISM FOR GRINDING MACHINES Filed Oct. '7, 1924 3Sheets-Sheet l Q NT.

.EA Walker my arm:

May 28, 1929. J. BATH ET AL RELIEVING MECHANISM FOR GRINDING MACHINES F iled Oct. '7, 1924 3 Sheets-Sheet 2 May 28; 1929. l J. BATH ET AL 1,715,054

RELIEVING MECHANISM FOR GRINDING MACHINES Fi1 ed 001. v, 1924 5 Sheets-sheaf 6 machine for grinding grooves intapsf and Patented- May 28, 1929.

JOHN BATH AND ERNIEST'A WALKER, or WORCESTER,MASSACHUSETTS, Assrsnons, i

BY uEsNnAssIenMENrs, 'ro'sAIn BATH. 1

YRELIEVING mEoH msM For enrnnms ivrnonmns." v

. I .Application filed :05am, 1924. seiiai N6. 742,227. V

invention relates "particularly to a hobs or other similar articles, in which machine provision is made for simultaneously relieving the threads or grooves as they are being ground. It is the object ofour pres ent invention to provide improved mechanism by which the depth of cut may be accurately ,determined without interfering with the regular operation of the relieving devices.

' Another object of our invention is to pro vide for increased accuracy in the axial feed ofthe grinding wheel. Our invention furwhich i v ther relates toarrang'ements and combinations of parts whichwill be hereinafter described and more particularly pointed out in the appended claims. A preferred form of our'invention is shown [the drawingsin I Fig. 1 is partial frontelevation of a grind ing machine embodyingourimprovements.-

Fig. 2is an endelevation of the parts shown in Fig 1.

' 1 Fig. 3is a detail plan view of certain parts, looking in the direction of arrow 3'in Fig. 2.

; the-operation 0 1 jf'Refe'rrlng tothe drawlngswehave shown Fig. 4 is a sectional end elevation, taken parts of a grinding machine comprisingabed or frame. 10 on which a hob or other work H is rotatablymounted between centers 11 and 12. The center 11 isheldin .the driving" spindle 13 of the machine and the center 12 is mounted'in the tail stock 14, slidable on an extension of the'head I MA grinding wheel (Figs, 1 and 3) is n'iounted on awheel spindle '15 carried by an axiallymovable wheelcarr age 16. The car r1a-ge'16 11s provlded with a nut, or boss 16 which engages a lead screw 17 (Fig. 3) "rotatably mounted in the bed or frame 10 and having a gem-1's (Figs. 2' and 3) -fast,thereon.

The gear 18 is, connected through an intermediate pinion 19 and gear 20 to a second 7 pinion 21 mounted on a stud'22and having Thearm' 23 is provided with ahandlej24 a hand lever or arm'23 fast with said pinion.

' frame .10 by bolts 28 the change gears 18, 19,;

selected that onerevolutionof thearm 23 and pinion 21 will move the wheel carriage 16 axially by the space between adjacent: grooves-to be cutL In using the i V This cam shaft gears 35,

bearing block-42 which I etoia swingingplateAS, pivoted at 4A to a- I; --bracket4;5, which, inturnis secured to the and also: with as stop 26 is positioned forengagement by plunger 25. The gears 19, 20- and 21- are ad j t bly mounted in a plate27secured to the i t (Fig. .2) which p mit angular adjustment of the plate- The spring plunger 25 is pressed plunger alsolongitudinally adjustable i 38101729, in the arm or'lever 23;-

In the preferred operation of our machine I 20 and 21 are so threads or v feeding device, the operator simply, pulls the plunger 25 to clear the stop 26 and then releases the plunger androtates the arm 23 until the; plunger-again engages the stop.

-- -The driving spindle13 is rotatablymount-1. j I

ed ina head 30 which is pivoted upon. a bearing sleeve 31 (Fig. 4) mounted on'the frame 10. The spindleis rotated.through' change. 'gearlng from a driving pulley 32and belt 33, or in any other convenient manner. 1 f

vAcam shaft 34 rotatable'in-b'earings 3 51 projecting forward from the spindle head 30..

drivingspindle 13. By a suitable selection 34 is driventhrough change Y 36, '37 and 38 (Fig. 2) from the ofchange gears, the cam shaft 34'may be rotated in any desired speed relation to the spindle'13 andthje work H.

A ser es ofrelievingcams i0 igs. r 5) are mounted on the shaftB in position for engagement by a caniroll .41- mounted on a is slidably secured frame 10. The swinging plate 43 has-a wearing plate 46 secured tothe'under sidethereof and engagedby-cams or eccentrics 50 ,(Fig. 5') mounted on asecond camshaft 51. The

bearing bracket 42'is preferably recessedfas indicated in Fig. .5 to receive oil or other lubricant. i V

. *The a... shaft 51' is provi ed with (a. has

dle 52by which it maybe movedjangularly to. raise and lowei the T011141. latch 53 on i ment 54 mounted therefrom v p 52 is slidable on the segment 54 and maybe secured-in anydesired positionthereon. I

' improved relieving n' echanism, theopera Having described'the construction of our tion thereof is as follows:

. Assuming that a llOlO H (rig-5 7 m be provided with a series of parallel grooves be evident that the grinding Wheel 60, it Will y I V must'be separated from the work While the thenext. 'For this purpose, the handle 52 is swung to the position shown in 2, in Which the plate 43 rests upon the smallest parts of the cams'or eccentrics 50. This althat the hob H lows the spindle I clears the edge of thewheel WV Whichis then moved axially by use of the feed arm 2-3.

' Thehandle52 is then swung to the left, as indicated by the arrow a inFig. '2 and 1s held 1 in any desired position by engagement or the latch '53 With thefsegmentfit.

An index line 61 maybe provided on a disc 62 on the spindle 13 and an' index fingel .60 cooper ates 'lieving cams lOare operative to alternatively thereof s not H I withdraw nfrom the wheel. Both the axial.

61, can easily determine when each revolutionoitthe holo is completed, and can then advance, the

handle 52 one or ,more notches along the segmented, until the handle finally engages'the 'adj'usted stop lVlllQlliCOl'l'Q- sponds'to the d'epth of out. V

I ev ry P si ion of the handle 52 the re.

move the work toward and from the wheel .V,thus relieving the back portion of each tooth of the "hobl I Byourimproved construction, the reliev ing camso'perate continually andthe'setting disturbed when the Work is and transverse relation of'the Wheel and work may be very accurately determined.

The Worlris easily.ivithdrawn from contact with the wheeland is-as restored to a predetermined position.

"Having I thus {described our invention and I I the advantages ,thereofl xve do not Wish to l be limitedjto the details herein disclosed, other:

, 'dle,'; a Work rotating member, means to .ro-

' variations. I

Wise than asset forth in the claims; but What we Gl;L1lII, 1SZ

'1. In a grindin machine, a Wheel spintate saidspindle andmemherflnea ns to regu- I larly vary the/relativepositionsof said spin- 'dle and member,:. and means including an auxiliary cam plate arranged to co act with said; first means to change the locus of such Qgln a grinding machine, Wheel'spindle',

aworlr rotating member, means to rotate said spindle and member, means to regularly vary the relative positions of said spindle and membe'r, said means comprisinga device to produce repeated relievingmovemcnts of 5 1 one ofsaid rotating parts'transv'ersely to the 65" axis thereof, and'means includingan aux- Wheel is moved axially from one groove to head 30 to Swing forward so With the index line 61. The operator, by watching the position of the line iliary cam plate arranged to co-act'withsaid first meansto changethe locus of said relieving movements.

. 3. Ina grinding machine, a Wheel spindle, a Workrotati-ngmember, a head in which-one of said parts isrotatahly mounted, means to rotate said spindle and member, a relieving device effectivertosproduce oscillating move merits of said tions of said cam plate engaging said relievmg device, and

7 means to'move said plate to produce an addi head to'va'ry the relative posi-I rotating parts, an auxiliary head, an auxiliary cam plate engaged by said 1 device, and additional meansto move said plate and device togive said head and "one rotating part c-additional independent movement relative to the other rotating part.

7 5. ln'a grinding machine, a Wheelspindle, a Work rotating member, meansto rotatesaid' spindle and member,"a head in whichione of said rotating p'artsis mounted, mean's to vary,

the relative positionsofsaid rotating parts, said means including 'arehevmg cam effectlve to produce oscillat ng movements of said head,1an auxiliary plate cooperating-" wim said cam and having astationary operative pos t1on,andmeans to sh ft; said operative vary the angular position of said:

position to head. U I c 6. In a grinding machine, a Wheelspind le, a Work rotating member, means to rotate said spindle'and member,- a head in, which one of said rotatmgparts smounted, meansto vary the relative positions of sai'd-rotatingf parts, said means including .arelieviiig cam effective to produce oscillating movements of said head, a roll 'enga'ged bys'a'id cam, and addi-f tional means including anauxiliary cam plate lie" arranged to move said roll andcam to {give said head an additional independent'move-f ment relative to the other,rotatingpart," 1 7. In a grinding machinefa Wheel spindle,

a work rotating membenineans to rotate said spindle and member, a head in Which one of said rotatingpartsismounted,means to vary ,7 i

the relative positions of said rotating parts,

saidmeans including a relievingcaniefiective to produce oscillat ng movements of saidhead,a cam-engagmgfroll, a swinginggplate on which said-roll is mounted, andmanual ,means tofmove said plate angularly.

8. Ina'grindingmachine, a Wheel spindle,

a ork rotating member,.means tolrotate said spindle and member, a llQfLCllIl jvhich one of.

said rotating parts'is mounted, means tovary the relative positions of said rotating vparts,

.said means including aseries of'relievingv inovements of said head,'an'e1ement co-opertically relative to said head.

10. the relative positions of "said rotating parts,1;

ating with a selected cam and having a sta tionary operative position, and means to shift 7 said operative position both axially, and ver- '9. In a'grinding machine, a Wheel spindle,

7' saidfmeans in'cludinga relieving cam effective to'produce oscillating movements of said head,a cam-engag ng roll, a swvlnglng plate on which said roll 1s mounted, and manual ymeans to move said plate angularly, said v .120 my manual means comprising a cam supporting said plate, and means to move said cam angu- 10, In agrinding machine, a wheelspindle,

' a Work rotating member, means to rotate said spmdleland member, ahead 1n WhlCh'OIlG of T said rotating parts is mounted, means to-vary r relative head, a cam-engaging roll, a swinging plate on Which said roll ismou-nted and manual 7 "nieans to move" said plate angularly, said I 7 'manual means comprising cam supporting a Work rotating member, means to rotate said 'spindle'and member, a head in which one of said rotating part s'is mounted, means to vary saidplatefand devices to accurately-determine theangularmovementof said cam. i

positions of said rotating parts, said means lncluding a relievmg cam efieotwo to produce osc llating movements of said 11.111 a grinding machine, in combination,

a grinding Wheel, a Work rotating'imember,

means to produce alternating relieving move ments between said Wheel and Work rotating member, additionalimeans to change'the locus of-such movements, and means to pro 'duce relativeaxial movement of said Wheel 7 I andwork rotating member, to an accurately cpredeterminedextent. j 3

testimony whereof We havejhereunto aflixed our signatures.- V

JoHNBATH.

7 ERNESTJA-WVALKEB. 

